Ayah

Word by Word
وَقَضَيۡنَآ
And We conveyed
إِلَيۡهِ
to him
ذَٰلِكَ
[that]
ٱلۡأَمۡرَ
the matter
أَنَّ
that
دَابِرَ
(the) root
هَٰٓؤُلَآءِ
(of) these
مَقۡطُوعٞ
would be cut off
مُّصۡبِحِينَ
(by) early morning
وَقَضَيۡنَآ
And We conveyed
إِلَيۡهِ
to him
ذَٰلِكَ
[that]
ٱلۡأَمۡرَ
the matter
أَنَّ
that
دَابِرَ
(the) root
هَٰٓؤُلَآءِ
(of) these
مَقۡطُوعٞ
would be cut off
مُّصۡبِحِينَ
(by) early morning
Translation

And We made known this decree to him, that the last remnants of those (sinners) should be cut off by the morning.
Tafsir

And We conveyed, We revealed, to him the matter, which was, that these [sinners] was to be eradicated by morning (musbiheen is a circumstantial qualifier,), in other words, their annihilation will take place in the morning.
Lut is ordered to leave with His Family during the Night
Allah tells:
فَأَسۡرِ بِأَهۡلِكَ بِقِطۡعٍ مِّنَ اللَّيۡلِ وَاتَّبِعۡ أَدۡبَارَهُمۡ
Then travel for a portion of the night with your family, and you go behind them in the rear,
Allah tells us that His angels ordered Lut to set out after part of the night had passed. They told him to walk behind them, to protect them. Similarly, the Messenger of Allah would walk in the rear of the army on military campaigns, in order to help the weak and carry those who had no means of transport.
وَلَا يَلۡتَفِتۡ مِنكُمۡ أَحَدٌ
and let no one amongst you look back,
meaning - when you hear the people screaming from their torment, do not turn around to look at them; leave them to face whatever punishment and vengeance is coming to them.
وَامۡضُواۡ حَيۡثُ تُوۡمَرُونَ
but go on to where you are ordered.
it is as if they had a guide with them to show them the way
وَقَضَيۡنَا إِلَيۡهِ ذَلِكَ الَامۡرَ
And We made this decree known to him,
meaning - We already told him about that.
أَنَّ دَابِرَ هَوُلاء مَقۡطُوعٌ مُّصۡبِحِينَ
that those (sinners) would be rooted out in the early morning.
meaning in the morning, as in another Ayah:
إِنَّ مَوۡعِدَهُمُ الصُّبۡحُ أَلَيۡسَ الصُّبۡحُ بِقَرِيبٍ
Indeed, morning is their appointed time. Is not the morning near! (11:81)
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